63 research outputs found
Metallic quantum well states and chemisorption:
No full textIn this thesis the adsorption properties of carbon monoxide (CO) on the epitaxial fcc-Co/Cu(100), Ni/Cu (100) and Cu/fcc-Fe/Cu(100) systems are reported.
The fcc-Co/Cu(100), Ni/Cu(100) systems are known to exhibit metallic quantum well (MQW) states at energies 1 eV or greater above the Fermi level, that disperse upward with increasing film thickness, but never cross the Fermi level and are less pronounced than MQW features in Cu/fcc-Fe/Cu(100) system. The presence of quantum size effects in electronic structure of these systems gives a possibility to modify molecule-surface interactions and influence CO adsorption. All these systems were explored with low energy electron diffraction (LEED), inverse photoemission (IPE), infrared absorption (FTIR) Spectroscopy and temperature programmed desorption (TPD).
TPD measurements revealed several desorption features upon CO adsorption on The fcc-Co/Cu(100), Ni/Cu(100) systems. These TPD features are linked
to the corresponding modes in IR spectra and suggest a range of bonding configurations at Co and Ni surfaces. The analysis of TPD and FTIR spectra are given. The adsorption properties of these thin film surfaces are compared to those of single crystal hcp-Co and Ni(100).
For increasing thickness of Cu on the fcc-Fe/Cu system, MQW states periodically cross and modulate IPE intensity at Fermi level. Changes in the peak temperature of TPD spectra are correlated with these modulations of IPE intensity. IR shows two features in the CO stretch frequency spectra, which are identified as CO adsorbed on terrace sites and at step sites. The IR results also suggest a correlation between intensities of these two spectral features and MQW states crossing the Fermi level.
The results of measurements done on the dimethyl disulfide (DMDS) molecule adsorbed on the Cu/fcc-Fe/Cu(100) MQW system is also reported. DMDS is
a simple example of an organic thiol, a class of molecules that exhibit self-assembly properties on metal surfaces. The measurements suggest possible modifications of molecular adsorption on the Cu surface. Similarities and differences of DMDS molecule adsorption on thin film Cu(100) and single crystal Cu(100) will be discussed.Ph.D.Includes bibliographical references (p. 123-130)by Levan Tskipur
COMPARATIVE ANALYSIS OF THE LAWS ON THE STATE LANGUAGE IN THE COUNTRIES OF THE SOUTH CAUCASUS
No full textAll three states of the South Caucasus – Azerbaijan, Georgia, and Armenia are involved in the “European neighborhood policy”, which indicates their sharing of general European values and harmonization of current and future legislation with the European legal system. From this point of view, their legislation on the state language is important since the state language is a means of impacting the realization of the principles of the communicative unity of the state, political consolidation, and territorial integrity of the country.Therefore, a comparative analysis of the development of the state language in the countries of the South Caucasus, linguistic sovereignty, human linguistic rights, and relations between the linguistic majority and the minority is relevant. The mentioned analysis will contribute to the mutual sharing of experience in the language policy of the South Caucasus countries.The paper compares the state language legislation of Azerbaijan, Georgia, and Armenia, the title and status of the law, the date and structure of the law, the preamble, the constitutional status of the state language, mandatory knowledge of the state language, areas of use of the state language, types of languages, the language of education, protection of the state language.The paper shows that the determination of the status of the state language is one of the central and important issues in the legal regulation of language relations, as it concerns not only the normative basis of language use in the state but also the rights of speakers of this or that language (both individuals and ethnic groups).All three states of the South Caucasus – Azerbaijan, Georgia, and Armenia are involved in the “European neighborhood policy”, which indicates their sharing of general European values and harmonization of current and future legislation with the European legal system. From this point of view, their legislation on the state language is important since the state language is a means of impacting the realization of the principles of the communicative unity of the state, political consolidation, and territorial integrity of the country.Therefore, a comparative analysis of the development of the state language in the countries of the South Caucasus, linguistic sovereignty, human linguistic rights, and relations between the linguistic majority and the minority is relevant. The mentioned analysis will contribute to the mutual sharing of experience in the language policy of the South Caucasus countries.The paper compares the state language legislation of Azerbaijan, Georgia, and Armenia, the title and status of the law, the date and structure of the law, the preamble, the constitutional status of the state language, mandatory knowledge of the state language, areas of use of the state language, types of languages, the language of education, protection of the state language.The paper shows that the determination of the status of the state language is one of the central and important issues in the legal regulation of language relations, as it concerns not only the normative basis of language use in the state but also the rights of speakers of this or that language (both individuals and ethnic groups)
Effects of dietary levan-type fructan on growth performance, blood profiles, fecal noxious gas emissions, and litter performance in lactating sows
No full textIn total, 28 multiparous sows (n = 7) and their litters were used to determine the effects of levan-type fructan supplementation on growth performance, nutrient digestibility, blood profiles, and fecal noxious gas emissions. The dietary treatments included (1) CON, basal diet; (2) FC1, CON + 0.1% fructan; (3) FC2, CON + 0.2% fructan; and (4) FC3, CON + 0.3% fructan. No significant differences were observed (P > 0.05) in body weight (BW), average daily feed intake, or back fat loss in lactating sows among treatments. However, blood lymphocyte concentrates were higher (P < 0.05) in sows fed levan-containing diets than in those fed the CON diet. Weaning BW and overall average daily gain (ADG) of piglets in the FC3 treatment were higher (P < 0.05) than piglets in the CON treatment. Blood lymphocytes and nutrient digestibility of sows, as well as the weaning BW and the ADG of piglets were increased linearly (P < 0.05) as the concentration of levan increased in the diet. The diarrhea score of piglets and the fecal gas emissions of sows decreased linearly (P < 0.05) as dietary levan increased. In conclusion, levan supplementation did not affect feed intake or decrease back fat loss of lactating sows, but it improved nutrient digestibility and immune ability, decreased fecal noxious gas emissions of lactating sows, and it improved growth performance and reduced diarrhea in piglets.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author
Berlesezetes cuspidatus Mahunka 1982
No full text<p> <b> <i>Berlesezetes</i> aff. <i>cuspidatus</i> Mahunka, 1982</b> </p> <p> <b>Distribution in Georgia.</b> E: Dedoplitskaro*</p> <p> <b>Global distribution.</b> Mediterranean</p> <p> <b>Ecology.</b> Steppe soils</p> <p> <b>Remark.</b> Georgian finding has some differences from original species regarding lamellar length and shape of the rostrum. The first author has sent the individuals to Dr. Sergey Ermilov who compared them with type material of Mahunka. Based on morphology alone, Georgian find is not a new species, although the genetic analysis may prove the contrary.</p>Published as part of <i>Murvanidze, Maka & Mumladze, Levan, 2016, Annotated checklist of Georgian oribatid mites, pp. 1-81 in Zootaxa 4089 (1)</i> on page 31, DOI: 10.11646/zootaxa.4089.1.1, <a href="http://zenodo.org/record/257567">http://zenodo.org/record/257567</a>
Polarimetry of the transient relativistic jet of GRB 110328/Swift J164449.3+573451
No full textWe present deep infrared (Ks-band) imaging polarimetry and radio (1.4- and 4.8-GHz) polarimetry of the enigmatic transient Swift J164449.3+573451. This source appears to be a short-lived jet phenomenon in a galaxy at redshift z= 0.354, activated by a sudden mass accretion on to the central massive black hole, possibly caused by the tidal disruption of a star. We aim to find evidence for this scenario through linear polarimetry, as linear polarization is a sensitive probe of jet physics, source geometry and the various mechanisms giving rise to the observed radiation. We find a formal Ks-band polarization measurement of Plin= 7.4 ± 3.5 per cent (including systematic errors). Our radio observations show continuing brightening of the source, which allows sensitive searches for linear polarization as a function of time. We find no evidence of linear polarization at radio wavelengths of 1.4 and 4.8 GHz at any epoch, with the most sensitive 3σ limits as deep as 2.1 per cent. These upper limits are in agreement with expectations from scenarios in which the radio emission is produced by the interaction of a relativistic jet with a dense circumsource medium. We further demonstrate how polarization properties can be used to derive properties of the jet in Swift J164449.3+573451, exploiting the similarities between this source and the afterglows of gamma-ray bursts
Reconciling Conflicting Interests of Coastal and Riparian States: The Hard Case of Black Sea Straits
No full textThere are two basic understandings of the regime of the Black Sea straits: the Black Sea straits as a legal regime and the Black Sea straits as a political regime [1]. The legal assessment of the Black Sea Straits regime requires determining what the existing regulation of the Straits is, how open the Straits are to international navigation, and if closed, whether there are real legal grounds for closing straits while the reference to the Black Sea Straits as a political regime allows for the possibility that straits may be closed for ensuring the security of Turkey and the Black Sea riparian states [1]. It is worth noting that arguments advanced by international legal scientists on the Black Sea straits as legal regime fundamentally differ from each other. Some scientists consider the Montreux Convention to be a major problem in the legal regulation of the Black Sea straits. They consider it necessary for Turkey to recognise the 1982 Convention on the Law of the Sea as a legally binding treaty [2]. Others argue that the main problem in regulating the Black Sea straits is the unilateral regulations adopted by Turkey (1994, 1998 and 2003 Regulations), which, in their view, violate the basic norms of the Montreux Convention, especially the regime of free passage through the straits established by this Convention [3; 4]. Another group of scientists believes that although the regime of the Black Sea straits is significantly restricted by Turkish unilateral regulations, these acts are aimed at protecting the marine environment and safety, and, therefore, the Turkish policy of regulating the Black Sea Straits is legally justified [1; 5]. This article is dedicated to the international legal regulation of navigation in the Black Sea Straits. The aim of the paper is to evaluate the current regime of the Black Sea Straits, the relationship and differences between the regime established by the Montreux Convention and the unilateral acts adopted by Turkey on the regulation of traffic in the Black Sea Straits, and to answer the question whether the urgent need to protect the natural environment and maritime safety entitles Turkey to restrict the regime established by the Montreux Convention. Thus, special attention will be drawn to the Montreux Convention, the rules and recommendations adopted by the International Maritime Organisation and the case law of international courts. In the view of the authors, the environmental and safety arguments put forward by Turkey for restricting navigation through the Black Sea Straits have two conceptual dimensions. First, these arguments are acceptable when it comes either to introducing norms related to the movement of ships to ensure safety of navigation or providing an obligation of notification to the Turkish authorities [6]. Another important thesis advanced by this article is that in each particular case, the regulations adopted by Turkey should be interpreted in the light of the recommendations made by the International Maritime Organisation. The main rationale of this argument is that under the existing regulations, Turkish authorities can still suspend the movement of ships in the straits for various reasons, some of which are quite vague. However, the article showcases that Turkey can, in case of pressing environmental need, when there is an urgent interest in the protection of the natural environment, act with the motive of protecting the natural environment, regardless of whether this action derives from a particular international treaty
Fabricage Levan
No full textDocument(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
3D bio-printing of levan/polycaprolactone/gelatin blends for bone tissue engineering: Characterization of the cellular behavior
No full textŞahin, Yeşim Müge (Arel Author), Buluş, Erdi (Arel Author)Poly(?-caprolactone) (PCL), gelatin (GT) and different concentrations of low molecular weight Halomonas levan (HLh) were combined and examined to develop physical networks serving as tissue scaffolds to promote cell adhesion for biocompatibility. Three-dimensional bioprinting technique (3D bioprinting) was employed during manufacturing the test samples and their comprehensive characterization was performed to investigate the physicochemical properties and biocompatibility. Physical properties of the printing materials such as viscosity, surface tension, and density were measured to determine optimal parameters for 3D bioprinting. The scanning electron microscope (SEM) was used to observe the morphological structure of scaffolds. Fourier-Transform Infrared Spectroscopy (FT-IR) and differential scanning calorimetry (DSC) were used to identify the interactions between the components. In-vitro cell culture assays using standard human osteoblast (Hob) cells showed increased biocompatibility of the printing materials with increasing HLh content. Thus, the formulations including the HLh are expected to be a good candidate for the production of 3D printed materials. © 2019 Elsevier LtdFen-C-YLP-120917-0549, SAG-B-090217-0036, FEN-E-130515-0175This study has been funded by BAPKO, Marmara University , Turkey; grant no: SAG-B-090217-0036 and Fen-C-YLP-120917-0549 ; grand no: FEN-E-130515-0175 . Appendix
Scutoverticidae Grandjean 1954
No full textFamily: Scutoverticidae Grandjean, 1954 Lamellovertex caelatus (Berlese, 1895) * (Fig. 4) Distribution in Georgia: Tsavkisi. Soil from natural meadow. N 41.68618 ˚ E 44.746342 ˚ 903 m a.s.l. Two individuals collected by M. Murvanidze, 12 Jun.2021. Global distribution: Palaearctic Ecology: Dry soils Remark: Previous records of L. caelatus in Caucasus are known from Novorosyisk and Northern Osetia (Shtanchaeva & Subías 2010). Georgian findings confirm the preference of this species to dry soils and mosses (Ayyldiz et al. 2005; Bernini 1976; Krisper et al 2002; Weigmann 2006), while Shtanchaeva and Netuzhilin (2003) refer to previous findings in soil litter. Hypovertex saxicola Sitnikova, 1975 * Distribution in Georgia: Tsavkisi. Soil from natural meadow. N41.686816 ˚ E44.736348 ˚ 1095m a.s.l. One individual collected by M. Murvanidze, 14 Aug. 2022. Global distribution: Southern Palaearctic Ecology: Dry montane soils Remark: New record for Georgia. Previous finding in Caucasus refers to the original species description by Sitnikova (1975) in Northern Osetia which was included in the identification key of palaearctic oribatid mites by Ghilarov & Krivolutsky (1975). Later, the author provided a more detailed description of the species and specified the sampling location of the type species—soil under Juniper shrubs close to Gizeldon River at 1400 m a.s.l. (Sitnikova 1980).Published as part of Murvanidze, Maka, Todria, Nino, Maraun, Mark & Mumladze, Levan, 2023, Annotated checklist of Georgian oribatid mites-II, pp. 50-62 in Zootaxa 5227 (1) on page 56, DOI: 10.11646/zootaxa.5227.1.2, http://zenodo.org/record/751821
Natronocalculus amylovorans gen. nov., sp. nov., and Natranaeroarchaeum aerophilus sp. nov., dominant culturable amylolytic natronoarchaea from hypersaline soda lakes in southwestern Siberia
No full textSeveral pure cultures of alkaliphilic haloaloarchaea were enriched and isolated from hypersaline soda lakes in southwestern Siberia using amylopectin and fructans as substrates. Phylogenomic analysis placed the isolates into two distinct groups within the class Halobacteria. Four isolates forming group 1 were closely related to a recently described Natranaeroarchaeum sulfidigenes and the other three strains forming group 2 represent a novel genus-level phylogenetic lineage. All isolates are saccharolytic archaea growing with various starch-like alpha-glucans including soluble starch, amylopectin, dextrin, glycogen, pullulane and cyclodextrin. In addition, group 1 can use levan while group 2 – inulin (plant storage beta-fructans). Group 1 strains can also grow anaerobically with either glucose or maltose using elemental sulfur as the electron acceptor. Both groups are moderately alkaliphilic with a pH range for growth from 7.2 to 9.3 (optimum between 8.0–8.8) and low Mg-demanding extreme halophiles growing optimally at 4 M total Na+. The major respiratory menaquinone is MK-8:8 and the core biphytanyl lipids are dominated by archaeol (C20-C20) and a less abundant extended archaeol (C20-C25) with PG and PGP-Me as polar groups. The four isolates of group 1 are suggested to be classified into a new species as Natranaeroarchaeum aerophilus sp. nov. (type strain AArc-St1-1T = JCM 32519T = UQM 41458T). The three isolates of group 2 are proposed to form a new genus and species for which the name Natronocalculus amylovorans gen. nov., sp. nov. is suggested (type strain AArc-St2T = JCM 32475T = UQM 41459T).Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.BT/Environmental Biotechnolog
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